70e52cba1b
* rl78/rl78-sim.ld: Add .saddr/.frodata section. * rl78/rl78.ld: Likewise. * rl78/rl78-sim.ld: Make room for virtual register banks. * rl78/rl78.ld: Likewise. * rl78/vregs.h: New. * rl78-sys.h: Use it. * rl78/swrite.S: New. * rl78/Makefile.in: Build it. * rl78/write.c: Use it.
69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/*
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Copyright (c) 2011 Red Hat Incorporated.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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The name of Red Hat Incorporated may not be used to endorse
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or promote products derived from this software without specific
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prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL RED HAT INCORPORATED BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "syscall.h"
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#include "vregs.h"
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#define SYS__exit SYS_exit
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.macro syscall_body number
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/* The RL78 doesn't really have an "interrupt" upcode, just
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BRK, which we emulate exactly. We use the STOP opcode,
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which is a breakpoint in the simulator. */
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mov A, #\number
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stop
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ret
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.endm
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.macro do_syscall name number
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__\name:
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.global __\name
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_\name:
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.weak _\name
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syscall_body \number
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.endm
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.macro syscall_returns name number
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__\name:
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.global __\name
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_\name:
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.weak _\name
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mov r8, #\number
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ret
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.endm
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#define S(name) do_syscall name, SYS_##name
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#define SYSCALL(number) syscall_body number
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#define ERR(name) syscall_returns name, -1
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#define OK(name) syscall_returns name, 0
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#define RET(name,val) syscall_returns name, val
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